William



(No Model.) W.. J. SIBLEY.

GRATE BAR.

Patented Feb.. 10, 1885r Ill/Ill a hmwmr.

CA Wm flatten li rrrasir Orrrcra VILLTAM J. SIBLEY, OF BROOKLYN, NEYVYORK, ASSIGNOR TO GEORGE H. CLARKE, OF SAME PLACE.

GRATE-BAR.

SPECIPIQATION formiag part. of Letters Patent No.312,02'7, datedFebruary 10,1885.

Application filed April 28, 1884.

To all whom it may cnccrn.-

Be it known that I-, XVILLIAM J. SIBLEY, a citizen of the United States,and a resident of Brooklyn,county of Kings,State of New York,

have invented certain new and useful Improvements in Grate-Bars, ofwhich the fol lowing is a specification.

The desideratum in the manufacture of furnace-grate bars made ofcast-iron as now carried out is to produce the requisite strength withthe minimum of metal, and simplify the molding process, to reduce theprime cost as much as possible, and to so construct the bar as toprovide for a perfect supply of air to the fuel.

In the grate-bar forming the subject of this invention perforations aremade through the sides, connectedwith openings on the top and alongitudinal passage which extends entirely through the ends of the bar,thus providing means for the perfect circulation of the air through thebar to the fuel, and removing from the interior a quantity of dead metalwhich adds little, if any, to the strength of the bar. 2 5 To facilitatemolding such a bar I avoid the use of all core work by making it in twohalves, the line ofjunction of whichis in a longitudinal vertical plane,and rivet the said halves together to constitute a hollow perforatedgrate-bar.

To insure against the twisting or warping of the bars, I form 011 theouter sides of the two halves a series of lugs so arranged as tointerlock with the adjacent bars on the old interlocking plan when theyare assembled in a furnace.

In the accompanying drawings, forming part of this specification, Figure1 is a perspective view of one of the castings forming one half of a barmade according to my invention. Fig. 2 is a similar View of the otherhalf. Fig. 3 is an end View of the two halves in position to be rivetedtogether. Fig. 4 is a longitudinal section of a bar in a furnace. Fig. 5is a trans verse section of three bars on the linear to, and Fig. 6 is atransverse section on the line 3/3] of Fig. 4.

The half a, Fig. 1, of the bar is shown in all the views as being to theleft side of the 00111- 50 pleted bar, and will be so designated in thisdescription, and the other half, a, Fig. 2, as

(No model.)

theright-side half. Both halves a and a have similar holes, b and I),east through them, which connect with the longitudinal grooves c and 0formed in their inner sides, extending 5 5 from end to end, and verticalgrooves 01 and (1, extending through their upper surfaces, so that whenthe two halves a and a are secured together by means of the rivets e 6,these grooves form passages connected with the side 6 holes, I) and b.The lower parts of the two halves a and aare solid, thus forming aclosed bottom to the longitudinal groove 0 c, and adding strength to thecompleted bar when the two halves are secured together.

The grate-bars,when set up in the furnace, rest at their ends on thebearers f f which are a short distance from the walls 9 g of thefurnace, so that air can pass freely through the ends of the bars aswell as through the side 0 holes, I) b,to the apertures d d in the topsof the bars, as indicated by the arrows in Fig. 4:, thus providing meansfor an abundant supply of air to the fuel, the passage of the samethrough all parts of the bar, as indicated, tend- 7 5 ing to keep thebar uniformly cool throughout its length. The longitudinal passage 0 0also insures a better distribution of the air from the side holes, Z)Z), to the apertures d d.

The tops of the bars may be longitudinally 8o grooved, as shown, toallow the air to be distributed more evenly through the fuel.

The ends of the bars are beveled or inclined from the bottom to the topside to prevent dust, &c., from the fire lodging in the ends of thelongitudinal grooves c c. The outer side of the left-side half, a, has aseries of lugs or projections, h h, along its upper edge, and a seriesof lugs or projections, h h, along its lower edge; and the outer side ofthe right- 0 side half, a, is provided with lugs i t along its centralpart, arranged so as to fit between the lugs h h on the half a when thebars composed of the two halves riveted together are placed side byside, thus locking the bars together 5 and preventing the two halvesfrom warping, The lugs z" t" at the ends of the right-side half,

a, control the longitudinal movement of the bars by contact with the endlugs or projections of the upper series, it h, on the left-side zoohalf, a.

The grate-bar may be made integral, with but I prefer to make it'of twohalves riveted together.

Having now described myinvention, what I claim, and desire to secure byLetters Patent, 1s

In combination, the left-side half, a, having holes I; and grooves c and01 formed in its inner surface, with the right-side half, at, havingholes I) and grooves 0' and d formed in its inner side, and rivets e e,by which they are secured together, thereby constituting ahollowgrate-bar with longitudinal and vertical airpassages and side holesconnected together, I 5 substantially as and for the purpose set forth.

In testimony whereof I have hereu nto set my hand, at New York, countyand State of New York, this 25th day of April, A. D. 1884:.

WVILLIAM J. SIBLEY.

Witnesses:

ALFRED SHEDLOOK, H. D. VVILLIAMs.

